A lot of the older dump trucks I've serviced used plain old 30 weight non detergent motor oil in the dump system. One of my customers with a leaky cylinder packing bought the stuff a case at a time. His frame and rear axle had no problems at all with getting rusty!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!